Valve grinding apparatus



May 18, 1954 w; L JR 2,678,521

VALVE GRINDING APPARATUS Filed March 2, 1951 2 Sheets-Sheet l nvvavroraWILLIAM -P. F'LoHR JR.

ATTORNEY May 18, 1954 w p FLQHR, JR 2,678,521

VALVE GRINDING APPARATUS Filed March 2, 1951 2 Sheets-Sheet 2 mvzwronWILLIAM P. FLaHk Je.

Arron/v51! ably mounted in cylinder ll.

Patented May 18, 1954 VALVE GRINDING APPARATUS William P. Flohr, 3n, Wa

to Landis Tool Compa ynesboro, Pa, assignor ny, Waynesboro, Pa.

Application March 2, 1951, Serial No. 213,652

Claims.

This invention relates to machines for grinding the faces of internalcombustion engine valves. Previous machines of this type had automaticmeans for efiecting the ejection of the work and the movement of thegrinding wheel toward and from operative position. Numerous attemptshave been made to produce apparatus for removing valves from a conveyorand place them in a chuck. So far, none of these has been particularlysatisfactory.

It is, therefore, an object of this invention to provide apparatuswherein valves may be loaded, ground and ejected continuously in anautomatic cycle.

A further object is to provide a new and improved mechanism forreceiving a work piece and placing it in a chuck.

A further object is to provide a machine in which several of thefunctions are initiated. in response to the reciprocations of the workloading apparatus.

In the drawings,

Figure 1 is a combined hydraulic, electrical and mechanical diagramshowing the relation of the various elements of the invention.

Figure 2 is an elevation of a work feeding device.

Figure 3 shows the work loading device, grinding wheel and a workremoving member in grim.- ing position.

Figure 4 shows the same apparatus with an unground work piece beingplaced in a chuck and a ground work piece being discharged from themachine by the work removing member.

Figure 5 is a front elevation showing the relation of the work feedapparatus of Figure 2 with the elements shown in Figures 3 and l.

In the drawings, numeral Hi indicates a wheel base having a grindingwheel i! rotatably mounted thereon. Said wheelbase is movable to wardand from operative position at an angle corresponding to the angle ofthe face to be ground on the work piece. The means for moving thegrinding wheel toward and from operative position consists of rapid feedpiston l2 a slow feed piston 3, both of which are described in detail inPatent 2,313,479.

A work piece M is held in a chuck is rotatably mounted in a headstock ofany suitable construc tion. Said chuck is actuated by a piston it slid-Means for removing work piece M from chuck it consists of an ejectingrod is attached to piston it in cylinder '22. Said piston is held ininoperative position by means of a spring 23. The means for 2 loading awork piece into a chuck consists of a piston is slidabl-v mounted incylinder 3i. A piston rod 32 is operatively connected to a Work holdingbracket 33. An extension 3c of said bracket has spaced cam surfaces 35and 3t actuating limit switches 3i and t8, the function of which will bediscussed later.

A lug 40 on bracket 33 provides a pivotal support for an arm 4! having awork removing memher @2 attached thereto. A link 53 is pivotallyconnected at one end to said work removing member and at the other endto a fixed support 44. Piston it also operates through a plunger incylinder 3! and lever 5! to actuate limit switch 52, the function ofwhich will be described later.

The feeding mechanism for wheelbase It includes a jet feed controlsimilar to that disclosed in Patent No. 2,486,244, granted October 25,1949, except that the pressure built up as a result of restriction ofthe jet acts to shift a valve to connect a pressure-operated limitswitch M? with a supply of fluid under pressure.

Operation Assuming that a work piece M has just been ejected by movementof ejector piston 22! to the right, the movement of said piston moveslever in a counterclockwise direction to shift ejector valve 6! andloader valve 52 to the left. In this position of the two valves, airfrom supply line E3 is directed by valve 62 through line 5 3 to ejectorvalve 65 which in turn directs said air through line 65 to the head endof loading cylinder 3|. Piston 30 in cylinder 3! is thus moved to theleft to place another work piece in chuck it. This movement of pistonBil is effected through arm 4! and link 43 to swing work removing member42 in a counterclockwise direction to discharge a finished work piece.At the same time, the unground work piece is placed in chuck 15.Movement, of piston 36 to the left is also efiective through plunger 59to actuate limit switch 52, which completes a circuit through line it toenergize CR6.

When CR6 is energized, a circuit is completed through contact H, line 12and normally closed contact 8!] of CR1 and line 8! to hold CR5energized. Another circuit is completed through contact '13 and line Mto initiate operation of a timer 9!]. A third contact 55 closes acircuit through line It to CH9. At the same time, the remaining contactsI? and is close a circuit to the chuck pilot valve solenoid mi),shifting valve to the left against spring 55! and connecting the leftend of valve l 54 with an exhaust line. Valve ifid is then shifted tothe left by spring its. In this position, fluid from line II! and lineE56 is directed through line 55'! and line i58 to the left end of chuckcylinder i1, shifting chuck piston is to the right to grip work pieceit.

The fluid from line l5! also passes through line I59 to the left end ofloader valve 52, shifting said valve, as well as ejector valve 6!, tothe right. In this position of the loader valve, air under pressure fromline 53 is connected to line 65, leading to the left end ofloading'cylinder 3i and causing loading piston 30 with associated partsto return to work receiving position. This movement of piston 30releases switch 52 to CR6, but 01% is already held through the normallyclosed contact 80 of CR1. This movement of piston 39 causes extension34' of bracket33 through cam surfaces 35 and 36 thereon to actu ateswitches 38 and 31 respectively. Switch 38 has two poles which will bereferred to hereafter as switch 381 and 3552. Switch 331 closes acircuit from Li through line no to energize CRIB and contact I 65 ofCRH. CRIZ is energized through contact tee of CRH. CRM is energized byswitch I88 so long as wheel support ii! is in the back position! Switchltd-has two poles which will be referred to hereafter as 58111 and i892.CRit then completes circuits through its contacts H85 and I86 toenergize indexing solenoid 58?. Said solenoid actuates an escapementdevice ltd, permitting a work piece it to drop from a conveyor (notshown) into'position in loader bracket 33.

When loader piston 30 is forward, switch 382 is closed to energize CR8and open contact 52 thereof. Opening contact 82 breaks'the circuit toCHI, which includes switch i802 which is closed when the wheelbase isback. The function of GR? is to deenergize CR6 while the loader isplacing a work piece in the chuck; I This prevents other functions ofthe machine from accidental operation during the chucking of a workpiece.

Closing limit switch 31 completes a circuit from L! through "line 19a,TR2 and line m2 through contact 15 of CR5 to energize CR9.

-When CR9 is energized, circuits are completed through two contactslHJ-and Hi and lines 1 12 and i i 3 to energize rapid feed valvesolenoid M, shifting the valve M5 to the left against spring H6 anddirecting fluid from pressure line H! through'line i it} to the left endofvalve H9, shifting said valve to the right. In this position, fluidunder pressure from pump 52! passing through lines H1, HI and I22, isdirected by said valve through line I23 and line I26 to the head end ofpiston E2 to move wheel support Hi into position for grinding wheel Itto grind the face of valve i4. Fluid from line I2lalso passes throughlines 139, Hi, throttle valve I32 in line 133 to the head endof slowfeed piston 13.

When wheel support I0 moves to grinding position, it closes switch 18Mand opens i862.- Switch i861, which is connected through line' 18! toOBI i, energizes CR1! and closes contact J56 thereof to in turn energizeCREZ.

Energizing CBlZ-closes the circuit through contact 65 to solenoid it'l,which actuates escapement device N38 to drop a work piece into loadingbracket 33. This circuit through contact 155 includes contact 381 ofindex limit switch 38. Thus, the loader and extension SAmust be in theright-hand position so that switch 38 can com-' plete the circuit. Thismeans that the wheelbase must be in grinding position and the loadingdevice in work receiving position before the escapement device functionsto drop a new work piece to the loader. However, so far as the functionof solenoid I8! is concerned, it is essential only that the loader be inposition to receive the Work. The position of the wheelbase is ofsecondary importance and may be either in or out. When switch 1802 isopened upon the movement of wheel support it to grinding position, itbreaks the circuit through contact 82 of CR8 to deepergize CR3, closingcontact 80 thereof so that the holding circuit to CR6 will be inreadiness after the actuation of CR6 by the movement of loading pistonto through switch 52.

ing circuit to CBS.

, When slow feed piston l3 completes its stroke,

it restricts the flow of fluid through line I40,

which is supplied from line 539. Said fluid then passes through line M!to the right end of valve M2, shifting said valve to the left againstspring [43. In this position of valve I42, fluid from line I38 isdirected through line 544 to shift piston 145 against spring M6 toactuate limit switch 541. Limit switch Mi completes a circuit throughline Hi8 and contact 13 of CR6 to initiate operation of timer 90 todetermine the duration of the grinding operation. At the end of apredetermined grinding period, the timer will open TRZ to deenergizerapid feed solenoid i it and permit valve i [5 to be shifted by springM6 to the right. In this position of valve H5, fluid under pressure fromline ll'i will" pass through line 20s to the right end of valve 1 i9,shifting said valve to the left. In the left-hand position of valve Ht,fluid under pressure from line !22 will be directed through line [52 andline I25 to the rod end of pistons 12 and i3, withdrawing wheelbase Illfrom grinding positionana resetting the slow feed piston l3.

Resetting piston '13 removes the restriction to flow of fluid from lineMt. Removing the restriction from line it!) releases the pressure on Inthis position of valve M2, line t lt is opened to exhaust, permittingspring M6 to move piston I45 downwardly and release limit switch Ml.Opening switch l il stops and resets timer 90.

In the back position of wheelbase iii, switch 801 is opened todeenergize CRH and CRIZ, which in turn deenergize CRit and solenoid 181,thus releasing escapement device its to prevent the dropping of morethan one work piece at a time onto loader bracket 33.

In the back position of the wheelbase, switch I302 is closed to energizeCR! through contact 82 of CR3. Energizing CR1, as described before,opens contact thereof to open the hold- Deenergizing CR6 opens contacts1-! and F3 to chuck valve solenoid we, releasing valve 59 which is movedto the right by spring I51. In this position, valve l50-connects line:52 with line I53 to shift valve l54-to the right against spring i535.Valve Hi4 thus connects pressure line 156 with line it! leading throughline N52 to the right end of chuck piston H5 and also to the right endof loader valve 62.

When chuck-piston i5 is moved to the left, chuck it releases the workpiece It.

- -When the loader valve 62 is moved to .the left,

' it directs air under pressure through line 64 to cylinder to the rightto eject the work piece M into the work removing member 42.

Movement of the ejector piston 2| to the right causes movement of lever6|] in a counterclockwis direction to shift the ejector valve 8! to theleft. In this position of valve 6 I, line 64 from valve 62 is connectedwith line 65 leading to the head end of loader cylinder 3| and shiftingloading piston 30 to the left. This movement of piston 30 as describedabove results in the removal of the finished work piece by a member 42and the placing of an unground work piece in chuck IS. The machin isthen ready for another grinding cycle.

I claim:

1. In a machine of the kind described, means for rotatably supporting awork piece, including a chuck, a grinding wheel and support movabletransversely toward and from operative relation with said work piece, aloading device for placing a work piece in said chuck, means forejecting a work piece from said chuck, a member for receiving the workpiece from said chuck and carrying it to a point of discharge, and meansresponsiv to movement of said loader in placing a work piece in saidchuck to actuate said memher to discharge a finished work piece, saidmeans comprising a connection between said loader and discharge member.

2. In a machine of the kind described, means for rotatably supporting awork piece, including a chuck, a grinding wheel and support movabletransversely toward and from operative relation with said work piece, amotor for effecting movement of said support, a loading device forplacing a work piece in said chuck, means responsive to the movement ofsaid loading device for actuating said chuck to grip the work, and meansincluding a switch operable by said loader upon movement to its originalposition to actuate said motor to cause movement of the wheel support togrinding position.

3. In a machine of the kind described, a chuck for rotatably supportinga work piece, a grinding wheel and support movable transversely towardand from operative relation with said work piece, a loading device forplacing a work piece in said chuck, a relay for controlling the cycle ofoperations of the machine including the movement of the wheel supporttoward and from operative relation, and a. switch operable by saidloading device when in position to insert a work piece in said chuck forcontrolling said relay to prevent 6 functioning of other parts of themachine including said wheel feed whereby said wheel is held ininoperative position during the chucking operation.

4. In a machine of the kind described, means for rotatably supporting awork piece, including a chuck, fluid pressure means for actuating saidchuck, including a solenoid valve, an ejector for removing a work piecefrom said chuck, fluid pressure means for actuating said ejectorincluding a motor, and a valve for directing fluid to actuate saidmotor, a shuttle valve actuated by fluid under pressure from saidchucking valve, means whereby said shuttle valve shifts saidiejectorvalve in one direction to place said ejector valve in position to directfluid to said ejector actuating means, said fluid being operable whenthe chucking valve is positioned to release awork piece, to shift saidshuttle valve to position to direct fluid, first to said ejector valveand then to said ejector actuating means.

5. In a machine of the kind described, means for rotatably supporting awork piece, including a chuck, fluid pressure means for actuating saidchuck, including a solenoid valve, an ejector for removing a work piecefrom said chuck,. fiuid pressure means for actuating said ejector,including an ejector valve, a shuttle valve actuated by fluid underpressure from said chucking valve, means whereby said shuttle valveshifts said ejector valve in one direction to place said ejector valvein position to direct fluid to said ejector, said fluid being operablewhen the chucking valve is positioned to release a work piece, to shiftsaid shuttle valve to position to direct fluid. first to said ejectorvalve and then to said ejector actuating means, and connecting meansactuated by operation of said ejector for shifting said ejector valve todirect fluid to move said loader to loading position.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,023,389 Olsen Apr. 16, 1912 1,583,205 Vanderbeek May 4, 19262,040,449 Stevens May 12, 1936 2,086,052 Silven July 6, 1937 2,092,895Stevens Sept. 14, 1937 2,260,843 Strong Oct. 28, 1941 2,436,561 Flygareet a] Feb. 24, 1948 2,527,804 Flygare et a1. Oct. 31, 1950

